[testimonial] You have a Minimum Viable Audience (MVA) when:
You’re receiving enough feedback from comments, emails, social networks, and social media news sites in order to adapt and evolve your content to better serve the audience.
You’re growing your audience organically thanks to social media sharing by existing audience members and earned media.
You’re gaining enough insight into what the audience needs to solve their problems or satisfy their desires beyond the free education you’re providing.
As you can guess, the first two aspects of an MVA feed the third. So let’s look at the specific benefits of starting with an audience rather than going straight to development of a product or service.
Brian Clark, CopyBlogger